Reading & Thinking...

Protected areas for the preservation of environmental, biological, or historical value

Areas which are not accessible with a certain type of vehicle (for example, mountain slopes inaccessible by regular cars)

A free-fire zone, in U.S. military parlance is a fire control measure, used for coordination between adjacent combat units. The definition used in the Vietnam war by US troops may be found in field manual FM 6-20

Battlefields or similar areas of conflict, where civilians are not permitted to go